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Preparation method of acrylic resin finishing agent modified by nano silicon dioxide (SiO2)-coated multi-walled carbon nanotubes

A technology of nano-silica and multi-walled carbon nanotubes, applied in the direction of coating, etc., can solve the problems of poor adhesion of the coating, application limitations, thermal stickiness and brittleness, etc., and achieve easy control, overcome thermal stickiness and brittleness, The effect of increasing strength

Active Publication Date: 2012-11-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Acrylic resin emulsion has excellent film-forming properties, mechanical stability and adhesion, smooth coating film, good gloss and color retention, and is an important coating film-forming material, but the characteristics of polyacrylate molecular linear structure As a result, the coating film has problems such as "hot stickiness and cold brittleness", solvent resistance, and poor adhesion of the coating, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: MWCNTs / SiO 2 Preparation of:

[0043] (1) Put 0.05 parts by weight of MWCNTs-COOH in a beaker, add 43.0 parts by weight of absolute ethanol and 11.0 parts by weight of deionized water, ultrasonically disperse for 20 minutes, and transfer to a three-necked flask;

[0044](2) Under mechanical stirring, start to drop a mixed solution of 1.7 parts by weight of tetraethyl orthosilicate and 43.0 parts by weight of absolute ethanol, drop it in 2 hours, and react at room temperature for 24 hours;

[0045] (3) Add dropwise a mixed solution of 0.4 parts by weight of silane coupling agent, 1.15 parts by weight of absolute ethanol and 0.16 parts by weight of deionized water, drop it in 30 minutes, and react for another 24 hours at room temperature;

[0046] (4) Suction filter the mixed solution obtained by the reaction with a 0.22 μm microporous membrane, then wash the filter cake with ethanol, repeat several times to remove the unreacted silane coupling agent, and then dr...

Embodiment 2

[0057] Step 1: MWCNTs / SiO 2 Preparation of:

[0058] (1) Put 0.05 parts by weight of MWCNTs-COOH in a beaker, add 43.0 parts by weight of absolute ethanol and 11.0 parts by weight of deionized water, ultrasonically disperse for 20 minutes, and transfer to a three-necked flask;

[0059] (2) Under mechanical stirring, start to drop a mixed solution of 1.7 parts by weight of tetraethyl orthosilicate and 43.0 parts by weight of absolute ethanol, drop it in 2 hours, and react at room temperature for 24 hours;

[0060] (3) Add dropwise a mixed solution of 0.4 parts by weight of silane coupling agent, 1.15 parts by weight of absolute ethanol and 0.16 parts by weight of deionized water, drop it in 30 minutes, and react for another 24 hours at room temperature;

[0061] (4) Suction filter the mixed solution obtained by the reaction with a 0.22 μm microporous membrane, then wash the filter cake with ethanol, repeat several times to remove the unreacted silane coupling agent, and then d...

Embodiment 3

[0072] Step 1: MWCNTs / SiO 2 Preparation of:

[0073] (1) Put 0.05 parts by weight of MWCNTs-COOH in a beaker, add 43.0 parts by weight of absolute ethanol and 11.0 parts by weight of deionized water, ultrasonically disperse for 20 minutes, and transfer to a three-necked flask;

[0074] (2) Under mechanical stirring, start to drop a mixed solution of 1.7 parts by weight of tetraethyl orthosilicate and 43.0 parts by weight of absolute ethanol, drop it in 2 hours, and react at room temperature for 24 hours;

[0075] (3) Add dropwise a mixed solution of 0.4 parts by weight of silane coupling agent, 1.15 parts by weight of absolute ethanol and 0.16 parts by weight of deionized water, drop it in 30 minutes, and react for another 24 hours at room temperature;

[0076] (4) Suction filter the mixed solution obtained by the reaction with a 0.22 μm microporous membrane, then wash the filter cake with ethanol, repeat several times to remove the unreacted silane coupling agent, and then d...

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Abstract

The invention relates to a preparation method of an acrylic resin finishing agent modified by nano silicon dioxide (SiO2)-coated multi-walled carbon nanotubes (MWCNTs). The acrylic resin emulsion has excellent film-forming property, mechanical stability and adhesion, but the characteristic of a linear structure of polyacrylate cause the problems of ''stickiness when heated and brittleness when cooled'' of the coating, poor solvent resistance, unstable adhesion of the coating and the like. The method provided by the invention comprises the steps of preparing MWCNTs / SiO2 nano composite particles through a sol-gel process of tetraethoxysilane, modifying the MWCNTs / SiO2 nano composite particles with a silicane coupling agent, and bonding the MWCNTs / SiO2 nano composite particles modified by the silicane coupling agent into the polyacrylate chains through an in-situ emulsion polymerization. The method provided by the invention uses water as a reaction medium, which is environment-friendly and can achieve continuous operation easily; and excellent characteristics of MWCNTs and SiO2 are introduced into acrylic resin, which can overcome the drawback of ''stickiness when heated and brittleness when cooled'' of the acrylic resin and can further increase the intensity, water resistance, heat resistance, gas permeability, yellowing resistance and flame resistance of the coating.

Description

technical field [0001] The invention relates to a preparation method of a finishing agent, in particular to a preparation method of a multi-walled carbon nanotube-modified acrylic resin coating agent coated with nano silicon dioxide. Background technique [0002] Acrylic resin emulsion has excellent film-forming properties, mechanical stability and adhesion, smooth coating film, good gloss and color retention, and is an important coating film-forming material, but the characteristics of polyacrylate molecular linear structure As a result, the coating film has problems such as "hot stickiness and cold brittleness", solvent resistance, and poor adhesion of the coating, which limits its application. [0003] Carbon nanotubes have excellent mechanical, thermal, electromagnetic and optical properties, and have good chemical stability. Using them for polymer modification can improve the mechanical properties, heat resistance, electrical conductivity and resistance of polymers. ab...

Claims

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Application Information

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IPC IPC(8): C08F292/00C09D151/10
Inventor 马建中刘海腾周建华孙友昌
Owner SHAANXI UNIV OF SCI & TECH
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